gcd-and-math.md

@@ -10,11 +10,9 @@ https://github.com/SVProgressHUD/SVProgressHUD
 ## You should do the following:
 1. Create a new branch from develop called feature/gcd
 2. Connect a new library `SVProgressHUD` via `CocoaPods`.
-3. Add a new button to `OrganizationInfoViewController` called “Calculate 10000th prime number”. It should calculate 10000th prime number in a background queue (global queue). Upon completion it should output the result in an `UIAlertController`. `SVProgressHUD` should be shown during calculation.
+3. Add a new button to `OrganizationInfoViewController` called “Calculate 100000th Fibonacci number”. It should calculate 100000th Fibonacci number in a background queue (global queue). Upon completion it should output the result in an `UIAlertController`. `SVProgressHUD` should be shown during calculation.
 4. Create a pull request.
 
-*HARDMODE: Write function for determining prime number yourself, without googling. Prime number = простое число.*
-
 
 ## You should be able to answer the following questions:
 * What is `GCD` used for?